Radar level meter is a commonly used in liquid level measurement instrumentation, it can effectively and accurately measure the height of the liquid or solid in the container, widely used in chemical, food, pharmaceutical and other industries, especially for oily wastewater and other liquid level measurement occasions with very high measurement accuracy and reliability requirements, radar level meter is the preferred choice of many companies to measure the instrument. However, for the radar level meter to measure oily wastewater in the process, there are some technical details that need attention, this paper combines the actual measurement cases to discuss how to correctly use the radar level meter to measure oily wastewater.

First, what do I need to pay attention to when measuring oily wastewater with radar level meter?

First of all, the choice of the beam angle, the beam angle refers to the radar level meter radiation out of the microwave beam angle, in the liquid level measurement, the choice of the beam angle directly determines the measurement accuracy and measurement range. For oily wastewater such as the dielectric constant of the medium is relatively large, choose a smaller beam angle can effectively prevent the radar level measurement error. Especially for wastewater containing a high concentration of oil, a smaller beam angle can effectively prevent the interference of oil on the radar level meter signal and improve the accuracy of measurement. Secondly, signal filtering and processing, the measurement process of oily wastewater, the signal interference is relatively large, effective signal filtering and processing is required to improve the measurement accuracy and stability. In terms of signal processing, the following two ways can be used to improve the measurement effect of the radar level meter: firstly, reduce the measurement range, for oily wastewater and other media susceptible to interference, the measurement range can be reduced by decreasing the slope of the corner of the radar level meter to reduce the signal interference. Secondly, increase the signal-to-noise ratio by increasing the signal-to-noise ratio of the radar level meter, it can effectively improve the signal quality and reduce the interference, and also reduce the error rate to further improve the accuracy of the liquid level measurement.

Second, the actual measurement case

Case 1 A pharmaceutical factory needs to measure the oily wastewater accurately in order to meet the wastewater discharge standard. After on-site survey and technical evaluation, the pharmaceutical factory chose a radar level meter with a small beam angle and excellent signal processing capability for measurement. In the measurement process, due to the oily wastewater in the oil content is relatively high, the need to target the radar level meter beam angle adjustment and signal processing, and ultimately successfully completed the measurement task, and accurately mastered the change rule of the wastewater level. Case two of a chemical plant's wastewater treatment system in the operation of the device appeared in the process of liquid level instability, after repair, maintenance and other suspected points of investigation, was found to be the use of radar level meter beam angle is too large, resulting in errors in radar type level measurement. According to the actual situation, the engineers and technicians carried out technical improvements, and by continuously optimizing the adjustment of the beam angle and signal processing mechanism of the radar level meter, the problem of unstable wastewater level measurement was finally successfully solved, and the accurate control of wastewater level was achieved.

In summary, for the radar level meter to measure the process of oily wastewater, attention needs to be paid to the selection of the beam angle and the technical details of the signal filtering process, in order to improve the accuracy and stability of the liquid level measurement. In practical application, by fully considering the characteristics of the medium and the actual process requirements, targeted technical adjustments and optimization of the radar level meter can effectively improve its measurement performance and application value, and contribute to the sustainable development of the industry.